Welding power sources for use with the gas metal arc welding (GMAW), gas tungsten arc welding
(GTAW) and similar processes normally are equipped with devices that permit on-off control of the
welding power output. When so equipped the electrode wire becomes electrically HOT when the power
source switch is ON and the welding gun switch is closed. Never touch the electrode wire or any
conducting object in contact with the electrode circuit unless the welding power source is off.
Safety devices such as interlocks and circuit breakers should not be disconnected or shunted out.
Before installation, inspection, or service, of equipment, shut OFF all power and remove line fuses (or
lock or red-tag switches) to prevent accidental turning ON of power. Disconnect all cables from welding
power source, and pull all 115 volts line-cord plugs.
Do not open power circuit or change polarity while welding. If, in an emergency, it must be
disconnected, guard against shock burns, or flash from switch arcing.
Leaving equipment unattended. Always shut OFF and disconnect all power to equipment.
Power disconnect switch must be available near the welding power source.
Protection for Wearers of Electronic Life Support Devices (Pacemakers). Magnetic fields from high currents
can affect pacemaker operation. Persons wearing electronic life support equipment (pacemaker) should consult with
their doctor before going near arc welding, gouging, or spot welding operations.
STANDARDS BOOKLET INDEX
For more information, refer to the following standards or their latest revisions and comply as applicable:
ANSI Standard Z49.1, SAFETY IN WELDING AND CUTTING obtainable from the American Welding Society,
550 Le Jeune Rd., P. O. Box 351040, Miami, FL 33135.
NIOSH, SAFETY AND HEALTH IN ARC WELDING AND GAS WELDING AND CUTTING obtainable from
the Superintendent of Documents, U. S. Government Printing Office, Washington, D. C. 20402.
OSHA, SAFETY AND HEALTH STANDARDS, 29CFR 1910, obtainable from the U. S. Government Printing
Office, Washington, D. C. 20402.
ANSI Standard Z87.1, SAFE PRACTICES FOR OCCUPATION AND EDUCATIONAL EYE AND FACE
PROTECTION obtainable from the American National Standards Institute, 1430 Broadway, New York, NY
ANSI Standard Z41.1, STANDARD FOR MEN'S SAFETY-TOE FOOTWEAR obtainable from the American
National Standards Institute, 1430 Broadway, New York, NY 10018.